The cross-sectional dimension b×h of Ping Jian is selected according to the diameter d of the shaft. The length l of the keyway is usually determined according to the width of the hub, and the key length is required to be slightly shorter than the hub by 5- 10mm, which meets the length series value.
According to the structure, use characteristics and working conditions of key joints. The following aspects should be considered when selecting: the size of the switch to be changed; Whether the parts connecting the shaft need to slide along the axis and the length of the sliding distance; Alignment requirements for connections; Whether the key needs to be fixed back and forth.
Extended data:
Universal Ping Jian, Semi-circle Key and Hook-Wedge Key Functions:
1, ordinary Ping Jian is the lightest, because it is simple in structure, easy to disassemble and neutral, suitable for high speed, variable load and impact occasions.
2. The shape of the semi-circular key is similar to that of the semi-circular key, and the semi-circular key can swing in the keyway to adapt to the shape of the bottom surface of the hub keyway. Usually used for the connection of tapered shaft ends, the connection workload is not large. For example, the cone shaft head drives the common A-type pulley to rotate by connecting the semi-circular key.
3. After assembly, due to the influence of inclination angle, the shaft and the parts on the shaft are inclined and eccentric, which is not suitable for high-precision connection.
Baidu Encyclopedia-Ping Jian